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Find hte sum of series

  1. Feb 8, 2007 #1
    1. The problem statement, all variables and given/known data

    heres the equation: http://img255.imageshack.us/img255/1669/untitledfa5.jpg

    2. Relevant equations

    i think we use cos(x)

    3. The attempt at a solution

    i know that cos(x) = cos(pi)

    so the limit is -1?

    whats the sum, i'm a bit confused.
    must be in simplest form
    what must i show. help.
  2. jcsd
  3. Feb 8, 2007 #2


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    I don't think you can express the sum much more simply than -1. The 'limit' you are talking about is the 'sum', right?
  4. Feb 8, 2007 #3


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    What you must show is that the infinite series representation of [itex]\cos(\pi)[/itex] is identical to the infinite series given in the exercise.
  5. Feb 8, 2007 #4
    excellent, okay ya its simple it is only -1. I just wasn't sure what they wanted to see. thanks
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